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The same crystal structure is found in numerous ionic compounds with formula AB 2, such as ceria (CeO 2), zirconia (cubic ZrO 2), uranium dioxide (UO 2). In the corresponding anti-structure , called the antifluorite structure, anions and cations are swapped, such as beryllium carbide (Be 2 C) or lithium oxide (Li 2 O), potassium sulfate (K 2 SO ...
Calcium fluoride is a classic example of a crystal with a fluorite structure. Crystallographic information can be collected via x-ray diffraction, providing information on the locations of electron density within a crystal structure. Using modern software such as Olex2, [4] one can solve a crystal structure from crystallographic output files.
The same crystal structure is found in numerous ionic compounds with formula AB 2, such as CeO 2, cubic ZrO 2, UO 2, ThO 2, and PuO 2. In the corresponding anti-structure, called the antifluorite structure, anions and cations are swapped, such as Be 2 C.
Rubidium sulfide has a cubic crystal similar to lithium sulfide, sodium sulfide and potassium sulfide, known as the anti-fluorite structure. Their space groups are ¯. Rubidium sulfide has a crystal lattice unit cell dimension of = 765.0 pm. [1]
CAS Number. 16941-12-1 ... Crystal structure. Anti-fluorite. Coordination geometry. octahedral Dipole moment. 0 D: Hazards
In chemistry, crystallography, and materials science, the coordination number, also called ligancy, of a central atom in a molecule or crystal is the number of atoms, molecules or ions bonded to it. The ion/molecule/atom surrounding the central ion/molecule/atom is called a ligand .
The coordination geometry of an atom is the geometrical pattern defined by the atoms around the central atom. The term is commonly applied in the field of inorganic chemistry, where diverse structures are observed. The coordination geometry depends on the number, not the type, of ligands bonded to the metal centre as well as their locations.
The structure of sodium oxide has been determined by X-ray crystallography.Most alkali metal oxides M 2 O (M = Li, Na, K, Rb) crystallise in the antifluorite structure.In this motif the positions of the anions and cations are reversed relative to their positions in CaF 2, with sodium ions tetrahedrally coordinated to 4 oxide ions and oxide cubically coordinated to 8 sodium ions.
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